Ukraine unleashed more than a hundred drones smuggled deep into Russia in what it called its most damaging attack yet.

A surprise Ukrainian drone attack that targeted Russian air bases hosting nuclear-capable strategic bombers was unprecedented in its scope and sophistication, and dealt a heavy blow to the Russian mil

KYIV, Ukraine — The covert operation was described as one for the “history books” by Ukraine’s president. In the span of a few hours on Sunday, nearly a third of Moscow’s strategic bomber fleet was destroyed or damaged with cheaply made drones sneaked into Russian territory, according to Ukrainian officials.